Stop-motion



(No Model.

D.G.RYDER.

' STOP MOTION.

N0.g 57,612. Pate nted Apr. 7 1896.

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M a David G122 (Zar W fWMLCWQ fi UNITED STATES PATENT OF ICE.

DAVID C. RYDER, OF CATSKILL, NEIV YORK, ASSIGNOR TO JOHN N. BRIGGS, OFCOEYMANS, NEIV YORK.

STOP-MOTION.

SPECIFICATION forming part of Letters Patent No. 557,612, dated April 7,1896.

Application filed May 12, 1894. Serial No. 511,002. (No model.)

Catskill, in the county of Greene and State.

of New York, have invented a new and useful Stop-Motion for PreventingMachinery being Rotated in a IVrong Direction, of which the following isa specification.

In many classes of machines, but especially in machines used forelevating cakes of ice, much damage is done by the reversal of thedirection of the moving parts of the machine, which reversal may beoccasioned by the slipping or breaking of driving-belts, overloading themachine beyond its capacity, and by many other causes, or the machinemay be carelessly started in a direction contrary to the one it isdesigned to be run; and the object of my invention is to prevent amachine from being rotated in a wrong direction. This object I attain bythe mechanism illustrated in the accompanying drawings, which are hereinreferred to and form part of this specification, and in which Figure 1is a side elevation of my invention as applied to an ice-elevator, onlya portion of the latter being shown. Fig. 2 is a de tached plan view ofthe end of the detent-arm. Fig. 3 is an enlarged longitudinal section ofthe bracket secured to the end of the detentarm, the spur-wheel on whichthe stop-motion operates being broken out to expose underlying parts.Fig. 4 is a horizontal section of Fig. 3 at the irregular line X X,showing the upper side of the head of the bracket. Fig. 5 is atransverse section of Fig. i at the line Y Y. Figs. 6 and 7 arehorizontal sections of the head of the bracket, showing modifications ofthe gripping mechanism.

As represented in the drawings, A is a detent-arm having one endpivotally secured to a side piece 1 of an ice-elevator.

B is a spur-wheel secured to a sprocketwheel shaft 2, saidsprocket-wheels. to prevent confusion, not being shown.

C is a pinion secured to a driving-shaft 3, and meshing into thespur-wheel B. Said driving-shaft is usually driven by a belt l,(indicated by dotted lines in Fig. 1,) and D is a bracket secured to thefree end of the detent-arm A.

The free end of the detent-arm A should be held by adjustable guys 5 orother suitable means from bearing on the teeth of the spun wheel B, andthus an unnecessary wear of the parts will be avoided. IVhen the guys 5are used, they can be attached to some adjacent overhead parts of thestructure or housing of the machine, and said guys should be arranged soas to effect an adjustment of the outer extremity of the detent-arni Ain respect to the center of the wheel B, and to prevent a swayingmovement of said arm. Said guys can be attached to a rib 6 of thebracket D or to any suitable part or attachment of the detent-arm. Thelatter is arranged in relation to the sp ur-wheel B in such manner thatwhen said wheel is revolving in the direction indicated by the arrow inFig. 1, its fixed end will be in a position to resist a pulling strain,if such a strain should be exerted on said arm. The arm A may be made ofwood or any suitable material with the metallic bracket D securedthereto, substantially as shown in the drawings; but when said arm ismade of metal, which in some cases is preferable, the arm and bracketcan be integral.

The bracket D has parallel side flanges 7, which are spaced apartsufficiently to allow the rim of the wheel B to pass freely betweenthem. In the forms of said bracket shown in Figs. 4 and 6 each sideflange is provided with a chamber 8 whose inner face has two inclinedplanes 9 which, in the opposite flanges, incline toward each other asthey approach the fixed end of the arm A. In the form shown in Fig. 5the top and bottom faces of each chamber are each provided with a lip10, which forms a retainer for keeping spherical rollers 11 in eachcompartment of the chamber, said compartments corresponding in length tothe inclined plane that forms the inner face of the compartment. Eachlip is provided with a cut-out 12 that allows a roller 11 to be insertedin the deeper end of the corresponding compartment. The inclined planes9 are arranged in such manner that, with the rollers in the deepest partof the compartments and the wheel 13 being rotated in the properdirection, the rim of said wheel will pass between said rollers withoutfrictional contact therewith; but immediately on the reversal of thedirection of ICO movement of said wheel the rollers 11 will move towardthe narrower part of the compartments and be forced against the oppositeedges of the rim of the wheel B and grip said rim with such tenacitythat said wheel will be held immovably thereby until a reversal of thedirection of movement of said wheel returns said rollers to the deeperpart of the compartments, whereupon the wheel B will be left free torevolve in the proper direction. For the purpose of maintaining thebracket D in a proper position in respect to the rim of the wheel B,adjustable bearing-pins 13 are inserted in the side flanges of thebracket D to bear against the sides of the rim of said wheel. Saidbearing-pins are preferably made of wood, and they may be either screwedor driven into holes formed for that purpose in the side flanges 7, andas the inner ends of said bearing-pins become worn away the bearing-pinscan be readjusted to bear against the edges of the rim of the wheel.

Preferably the end of the bracket of each form herein shown anddescribed is provided with lugs 14, to which a safety-check E can beattached. Said safety-check is designed to operate in case when from anycause the rollers 11, or other clamping mechanisms herein shown anddescribed, may fail to prevent the wheel B from revolving in the wrongdirection; and it consists of arms 15, which extend from the end of thebracket, and tilting levers 16, which are loosely fitted to oscillate onan arbor 17 attached to said arms. The posterior arms 18 ofsaid leversare arranged to bear upon the teeth of the wheel B, and preferably theyare of sufficient length to bear simultaneously upon two of said teeth,so as to prevent the opposite ends of said levers from being raisedabove their proper position. The anterior arms 19 of said levers areconnected by a cross-bar 20 whose lower part inclines outwardly, so asto allow the teeth of the wheel B, when the latter is revolving in theproper direction, to raise the anterior end of the levers 16, and whensaid wheel begins to revolve in the contrary direction the cross-bar 20will engage with the advancing side of a tooth of said wheel and becarried down to the bottom of the space between two adjacent teeth andthereby positively prevent the wheel from revolving farther in thatdirection. The arms 19 are bent to form an opening 21 which, when thelevers 16 are tilted to carry the cross-bar 20 into a space between twoof the teeth, will allow a tooth of the wheel to enter therein, asindicated by dotted lines in Fig. 3.

The pivot on which the levers 16 are arranged to oscillate is located inrelation to a shoulder 22 on each of said levers, so that the latterwill acquire a slight oscillatory motion when said shoulders are aboutmidway between two adjacent teeth of the wheel B, and thereby thecross-bar 20 will be carried into a position where it will take againsta tooth of the wheel B in case the latter is revolving in the wrongdirection, and said wheel will be positively stopped in the manner abovedescribed. On resuming the motion of said wheel in the proper directionthe succeeding tooth of the wheel B will take against the inner side ofthe cross-bar 20, and, by the angularity of the latter, the levers 16will be re stored to their normal position, so that the wheel B can berevolved in the proper direc tion.

In the modification shown in Fig. 6 the bracket D'is provided withchambers 23,which are substantially the same as those previouslydescribed in respect to Fig. 5; but instead of the spherical rollersshown in the last-named figure wedgeshaped blocks 24 are inserted insaid chambers to bear against the faces of the inclined planes 25, withthe adjacent faces of said blocks slightly touching the edges of the rimof the wheel B without interfering with the latter when revolving in theproper direction,but when said wheel begins to re-' volve in the wrongdirection the blocks 2% will be automatically moved toward the shallowerpart of said chambers until they immovably clamp the wheel B, and inthis manner they effect the result described in respect to the saidspherical rollers.

I11 the modification shown in Fig. 7 the bracket D is provided withchambers 26, in which cams or disks 27 are pivoted eccentrically andarranged in such manner that, when the wheel B begins to revolve in thewrong direction, the fuller part of said disks will be carried to bearwith exceeding pressure against the edges of the wheel-rim, and therebythe motion of said wheel will be stopped. Each disk 27 has its peripheryprovided with an angular projection 28 to prevent its being rotated toofar in either direction, said projection taking against the rim of thewheel B when the disk is rotated in one direction and against the backof a chamber 26 when rotated in the opposite direction, but in eithercase the rotations ofthe disk will be stopped by said projection.

hat I claim as my invention, and desire to secure by Letters Patent,is-- 1. The combination of arevoluble wheel, B, a detent-arm, A, havingone of its ends pivoted to the housing of said wheel and its oppositeend supported by adjustable guys, 5, and a head, D, secured to theadjustable end of the detent-arm and provided with side flanges, 7,which pass down loosely at each side of the rim of said wheel; each ofsaid flanges being provided with a chamber, 8, and gripping mechanismtlierein-substantially as shown and described-adapted to grip the rim ofsaid wheel when rotating in the wrong direction, as herein specified.

2. The combination of a revoluble wheel,B, a detent-arm, A, having oneend pivoted to the housing for said wheel and its opposite end supportedby adjustable guys, 5, and provided with ahead, D, having side flanges,7,

side flanges, 7, gripping means in said head, and bearing-pins, 13,inserted in said flanges and adjustable from and toward each other; saidbearingpins being arranged to bear against opposite sides of the rim ofthe wheel B to retain the head D in position in respect to the rim ofsaid Wheel, as and for the purpose specified.

DAVID C. RYDER. W'itnesses:

JOEL NELSON, PLATT S. WHEAT.

